/*
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Copyright (c) 1994-1996 NeXT Software, Inc. All rights reserved.
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*//*
* Apple16X50UARTTypes.cpp
* Determine what type of UART is present, determine it's capabilities such as FIFO depth
* and Master Clock frequency, and verify that it is working as expected. These routines
* are expected to be called prior to Apple16X50UARTSync::start(), and so
*
* 2002-04-10 dreece created.
*/
#include"Apple16X50UARTTypes.h"
#include"Apple16X50BusInterface.h"externconst IONamedValue gUARTnames[] = {
{ kUART_Unknown, "Unknown" }, // Unknown UART
{ kUART_8250, "i8250" }, // Original ACE UART
{ kUART_16450, "16450" }, // Improved UART, No FIFO
{ kUART_16550, "16550" }, // Broken FIFO (unusable)
{ kUART_16550C, "16550AF/C/CF"},// Working 16 byte FIFO
{ kUART_16C1550, "16C1550" }, // Powerdown Mode & FIFO
{ kUART_16C650, "16C650" }, // 32 byte FIFO
{ kUART_16C750, "16C750" }, // 128 byte FIFO
{ kUART_16C950, "16C950" }, // 128 byte FIFO
};
#defineINB(reg) ( provider->getReg((reg), refCon) )
#defineOUTB(reg,val) ( provider->setReg((reg), val, refCon) )
/* identifyUART() - This function attempts to identify the type of UART
* present. This routine is only intended to be run from the init method, before the chip is
* active.
*/
tUART_Type //Apple16X50UARTSync::
identifyUART(Apple16X50BusInterface *provider, void *refCon)
{
register UInt32 tmp;
DEBUG_IOLog("Apple16X50UARTSync::identifyUART()\n");
/* Verify that the BRG Divisor Register is accessable */
OUTB(kREG_LineControl, kLCR_DivisorAccess); /* Set DLAB=1 */
OUTB(kREG_DivisorLSB, 0x5a);
if (INB(kREG_DivisorLSB)!=0x5a) return kUART_Unknown;
OUTB(kREG_DivisorLSB, 0xa5);
if (INB(kREG_DivisorLSB)!=0xa5) return kUART_Unknown;
OUTB(kREG_LineControl, 0x00); /* Set DLAB=0 */
DEBUG_IOLog("Apple16X50UARTSync::identifyUART() BRG Divisor is accessable\n");
/* Verify that the Scratch Pad Register is accessable */
OUTB(kREG_Scratch, 0x5a);
if (INB(kREG_Scratch)!=0x5a) return kUART_8250;
OUTB(kREG_Scratch, 0xa5);
if (INB(kREG_Scratch)!=0xa5) return kUART_8250;
DEBUG_IOLog("Apple16X50UARTSync::identifyUART() Scratchpad is accessable\n");
/* Look for FIFO Bits in FIFO Control Register */
OUTB(kREG_FIFOControl, kFIFO_Enable);
tmp = INB(kREG_IRQ_Ident) & kIRQID_FIFOEnabled;
OUTB(kREG_FIFOControl, 0x00);
switch (tmp) {
case0x00 : return kUART_16450;
case0x40 : return kUART_16C650;
case0x80 : return kUART_16550;
case0xC0 : break;
}
DEBUG_IOLog("Apple16X50UARTSync::identifyUART() FIFO Enable status returned 0xC0\n");
// Check for an alternate version of the Scratchpad...
OUTB(kREG_LineControl, 0x00);
OUTB(kREG_Scratch, 0xde);
OUTB(kREG_LineControl, kLCR_DivisorAccess);
OUTB(kREG_Scratch, 0xa9);
tmp = INB(kREG_Scratch);
OUTB(kREG_Scratch, 0x00);
OUTB(kREG_LineControl, 0x00);
if ((INB(kREG_Scratch) == 0xde) && (tmp == 0xa9)) {
DEBUG_IOLog("Apple16X50UARTSync::identifyUART() Alternate Scratchpad is accessable\n");
return kUART_16C650;
}
// Check for power-down bit in the 16X1550
tmp = INB(kREG_ModemControl) & 0x80;
OUTB(kREG_ModemControl, 0x00);
if (tmp == 0x80) return kUART_16C1550;
// Look for the FCR, which is present only in the 16750 and later
OUTB(kREG_FIFOControl, kFIFO_Enable);
OUTB(kREG_LineControl, 0x00); /* Set DLAB=0 */
OUTB(kREG_LineControl, 0xbf); /* Set DLAB=1 */
tmp = INB(kREG_LineControl);
OUTB(kREG_LineControl, 0x00); /* Set DLAB=0 */
OUTB(kREG_FIFOControl, 0x00);
if (tmp == 0x80) {
DEBUG_IOLog("Apple16X50UARTSync::identifyUART() 0xBF Magic number accepted!\n");
return kUART_16C750;
}
return kUART_16550C;
}
// XXX Need to move a few other functions here, like determineMasterClock()
#undefINB
#undefOUTB